/Engine/Source/Runtime/RHI/Public/RHIResources.h
Called from RHI thread to perform custom present.
true if native Present should be also be performed; false otherwise. If it returns true, then InOutSyncInterval could be modified to switch between VSync/NoVSync for the normal Present. Must match value previously returned by NeedsNativePresent for this frame.
bool Present ( int32 & InOutSyncInterval )